Got stock springs?
My '72 manual says 165cc if it's dry & 145cc since 20cc will still be inside.
I was told to try 10wt in mine, 20 if I liked a stiffer ride.

Stock springs. I pulled mine completely apart yesterday and cleaned them thoroughly. You definitely need some "special tools" to get all the grunge out. I reassembled them this afternoon and will install them on the bike in the morning. My front end was really stiff, so I am trying some 5wt oil to see what I get.